Pulverized-fuel feeder.



iff/J@ @13 QL?? l E. F. SYEWART.

PULVERIZED FUEL FEEDER.

APPLICATIAON FILED )UNI-:1.6, 1916. Patented 27 ISHEETS-SHEET i.

llllllll 1' E. F. STEWART.

PULVERIZED FUEL FEEDER. l APPLICATION HLED JUNE 1'6. 191e.

1 ,217,237. Patented 1191).,27, 1917.

:SHEETS-SHEET 2.

E. F. STEWART.

PULVERIZED FUEL FEEDER.

APPLICATION FILED JUNE 16, 191e.

I Patented Feb. 27, 1917,

7 SHEETS-SHEET 3.

Y, 1m W m E.' F. STEWART.

FULVERIZED FUEL FEEDER. APPLICATION FILED lUNE-IS. |916.

Patented Feb. 27,1917.

ISHEETS-SHEET 4.

www@ A l I ESQWUT #M fi@ lsHEETs-'SHEET 5.

Patented Feb, 27, 1917.

n l l 26m F. STEWART.

PULVERIZED FUEL FEEDER.

APPLICATION HLED JUNE 16, 1916.

JE/amp 5 attozucu E E. F. STEWART.

PuLvERlzED FUEL FEEDER.

APPLICATION FILED IUNETG. 1916.

TSHEETS-SHEET 6.

l@ f/f Peeented Feb. 27,1917.

Eu Fl STEWART.

PULVERI'ZED FUELFEEDER.

APPucmon mio :une I6. 191e.

l lsnins-sussr 1.

Jg J5' 2 u f 14 o 'A 7 i l o* ZJQA 27 o Patented Feb.27,1917.

lis

UNITED STATES PATENT oEEIcE.

EDWIN FERGERSON' STEWART, 0F WOODCLIFF,NEW JERSEY, ASSIGNOR OF ONE-HALF T THE BARRETT COMPANY, 0F NEW YORK, N'. Y., AVCORPORATION.

PULvERIzED-FUEL FEEDER.

lVoodclif, in the county of Hudson and- State of New Jersey, have invented ycertain new' and useful Improvements in. Pulverized-Fuel Feeders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters-and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in apparatus for feeding pulverized coal, fuel pitch, etc., and the object in view is to produce a simple and eiicient apparatus of this naturel so constructed and operated as to avoid the danger of the materlal clogging or arching in the bin or hopper and insuring a continuous feeding 'of the material to the furnace which is an essential in maintaining a continuous and uniform heattherein.

Heretofore in' apparatus commonly employed for feeding pulverized coal, pitch,

etc., it has been the practice to draw in the sides of the. bottom to the central opening where either the feed'chain or feed screw is located and, by such construction, there is a tendency to compress the material so that it will bridge over the v.central discharge openg and not How evenly to the chain or screw feeder.

It is the object of they present invention to avoid this trouble and to provide means whereby the material may be expanded slightly at the location where it reaches the bottom or table of the small feed bin and there fed continuously and uniformly from the entire horizontal area of the descending column.

'45 The apparatus for obtaining this desired result is embodied in the features of the present invention and which is clearly illustrated in the accompanying drawings forming a art of .this application.

In t e drawings:

Figure 1 is a side elevation of the apparatus.

Fig. 2 is a' view in elevation from a standpoint at riht angles to the plane in which 5s Fig. 1 is ta en.

Speeication of Letters Patent.

Patented Feb. 27, 1917.

Application led .Tune 16, 1916. Serial No. 104,130. l

Fig. 3 is an enlarged detail view in elevatlon of a p0rt1on ofl the apparatus shown in F1g. 2 and illustrating the lower portion of the bin and the exit opening and slide gate for controlling air supply and degree of -vacuum in the vacuum chamber.

Fig. 4 is an enlarged detail in elevation of the lower portion of the bin and vacuum chamber on the side at right angles to the vertical plane in whichFig. 3 is shown.

F1g. 5 is an enlarged detail view showing the beveled gear connections for driving endless conveyer chains.

Fig l6 is a sectional view on line 6-6 of F1g. 3 looking downward', parts being shown in top plan. l

Fig. 7 is a sectional view on line 7--7 of Fig. 3. v

Fig. 8 is a sectional view on line 8 8 of Fig. 6.

Fig. 9 is a detail view of the top of the table over which the endless conveyer chains pass. y

Fig. 10 is a sectional view vertically and centrally through a portion of the fan casing ndfonnections. therewith for regulating the Fig. 11 is a sectional view on line 11.-11 of Fig'. 10 looking in the direction of the arrow.

Fig. 12 is a sectional View on line 12-12 of Fig. 10.

Reference now being had to the details of the drawings by numeral, 1 designates a bin 4with diverging sides having mounted underneath the lower tapering end thereof a horiesv 6 of the drawings, and-said shaft has fixed thereto sprocket wheels 6 which are adapted to engage one or another of the a ertures 7 formed in the under surface of t e gate or slide 2. Fixed to one end of the shaft 4 is a pulley wheel 8 having grooves in the circumerence thereof and a out which the ends of the chain 9 passes andis attached, and

which latter affords means whereby the shaft`4 may be rotated in one direction or the .other accordingly as .it may be desired to regulate the feeding of the material' making exit from the lower portion of the bin. In order to guide the gate in its horizontal 'movements, anti-friction wheels 10, shown in Fig. 3 of the drawings, are journaled in thel bracket members 11 upon the wall of the feeder casing and bear against the upper surface of the gate or slide 2.

The table is designated by numeral 11', av top plan View of which is shown lin Fig. 9 of the drawings and in section in Fig.- 8, and has a series of recesses 12 'on one end, separated by lugs or projections 13, and on its opposite end. has similar recesses 22, separated by the lugs 23, the recesses and lugs being in staggered or alternate relation upon opposite ends of the table.

Sprocket wheels 14 are journaled upon the shafts 15 on one side of the apparatus, as shown clearly in Fig. 6 of the drawings, and a similar shaft 17 is journaled -Upon the opposite side of the frame and upon which series are the sprocket wheels, designated by numeral 18, and sprocket chains, designated by numeral 19, pass about the several sprocket wheels 14 'and engage said recesses 12 in one end of the table 11', while similar conveyer chains, designated in the drawings by numeral 21, pass over the sprocket wheels 18 and engage similar but alternately arranged recesses 22 formed in the opposite end of the table. j

The shaft 15 has a beveled gear 24 fixed at one end and a similar beveled gear 25 is fixed to the end of the shaft 17, said wheels 24 and 25 meshing with beveled pinions 26 fixed to the shaft 27, and 28 designates a driving wheel which is fastened to the shaft 27, adapted to be driven from any suitable source of supply of power, not shown.

A conveyer chain tension device is shown clearly in Fig. 8 and consists of an integral bracket' extension 27 upon the under surface of the table and which carries an adjustable plate 28', slottedas at 29 for the reception of the bolt 30 and also at 31 for the reception of the bolt 32, having a convexed segment member. 33 against the rounded edge of which the two sets of chains are adapted to frictionally slide when moving in opposite directions, as per the arrows in Fig. 8.

Underneath the conveyer chains is a vacuum chamber 34 having an opening 35 in one end which is adapted to vcommunicate `with a suction pipe 36 lleading to the fan chamber 37, shown in Fig. 2 of the drawings, and to which casing 37 a pipe 36 is connected. v

Referring to Fig. 3 of the drawings, it will be seen that said vacuum chamber is provided with an opening 39 in the lower and receiving a nut 47 upon its outer end f and by which bolt and nut the slide or gate may be held in different adjusted positions to regulate the suction or draft through the opening to the hopper.

The suction from the fan is further regulated by the mechanism shown in Figs. 1() and 12 of the drawings, and in which the fan casing 37 is shown as having a central flarged opening 48 in which a spider frame 49, a V'detail of which is shown in Fig. 12, is mounted and which frame has a central circular-outlined portion receiving the end of the pipe 36. An adjustable collar 50, havingtwo parallel ends 51, as shown in Fig. 11 of the drawings, is held in clamping relation with the plpe 36 through the medium of the bolt 52 and nut 53, said collar having a circumferential flange 54, which, by being positioned near to or spaced apart from the end of the spider framev 49, may regulate the amount of air allowed to be drawn through said space into the fan chamber.

Vertically adjustable slides, designated by numeral 55, are mounted one upon each side of the lower portion of the bin and which are movable in slots 56, shown clearly in Fig. 8 of the drawings, and the upper end of said slide 55 carries a threaded boss 57 engaging the threaded portion of a bolt 58 which passes through an aperture in a bracket 59 upon the side of the bin and upon which bolts 58 are adjusting nuts 60'.

adapted to hold the, slides 55 in different adjusted positions, accordingly as it may be desired to regulate the feeding of the material being carried forward by the endless conveyer cha ins, the locations of said slides relative to the conveyer chains being illustrated clearly in Fig. 8.

In operation, the pulverized material to be fed is allowed to pass from the bin into the chamber beneath in quantities to` be regulated by the slide or gate 2, the movement of which is affected through the medium of the chain 9, as described. Power is applied to the endless conveyer chains driving the same in opposite directions, said chains movable upon the upper surface of the table 11 upon which the pulverized material is deposited by gravity from the binabove. The chains moving in opposite directions will tend to feed in opposite directions uniformly across the entire horizontal area of the descending column of material and thus avoid drawing or compacting the material together as is commonly the result in other pulverized fuel feeding apparatus and, by this uniform carrying of the pulverized .material simultaneously .in opposite directions,

Iit will retain its origmal'incoherent quality and compactmg will be avoided, all of which will tend to maintain a continuous and uniterial is fed by the conveyerssuction meansv connected to said chamber, and means for regulating the suction power.

2. An apparatus for feeding pulverized fuel, comprising a bin with anv adjustable gate regulating the exit therefrom, two series of endless conveyers moving in opposite directions underneath the exit end of the bin, slides having adjustable movements above the conveyer chains and relative thereto, a vacuum'chamber into which the material is fed by the conveyers, suction means connected to the said chamber, and means for regulating the suction power.

3. An apparatus for feeding pulverized fuel, comprising a bin'with an adjustable gate regulating the exit therefrom, two series of endless conveyers moving in opposite directions underneath the exit. end of the bin, a table upon which said conveyors move, means for guiding the conveyers, a vacuum chamber into which the material is fed by the conveyers, suction means connected to the vacuum chamber, and means for regulating the suction power.

4. An apparatus for feeding pulverized fuel, lcompr1sing a bin with an adjustable gate regulating the exit therefrom, two series of endless conveyers moving in opposite directions underneath the exit end of the bin, a table upon which said conveyors move, the opposite ends of said table having alternate recesses and lugs adapted to guide said copies of this patent may be obtained for conveyers, a vacuum chamber into which the material is fed by the conveyers, suction vmeans'connected to the vacuum chamber,

and means for regulating the suction power.

5. An apparatus for feeding pulverized fuel, comprising an adjustable gate and horizontal guideways in which the same is mounted, a table underneath the gate, endless conveyer chains movable in opposite directions upon said table, vertically movable slides, one upon either side of said gate and 'having movements relative to the conveyer chains, a vacuum chamber into which the material is fed by the chains, suction means connected to the vacuum chamber,

and means for regulating the suction power.4 6. An apparatus for feeding pulverizedv fuel, comprising a bin with an adjustable gate regulating the exit thereof, two series of endless conveyors movin in opposite directions underneath the exit end of the bin, a vacuum chamber into which the ma` 4terial is fed by the conveyers, said chamber having an opening and gate regulating Vthe same, a suction pipe leading from the vacuum chamber, a fan casing having an openmg, a spider frame in-said opening and through which said pipe passes, an adjustable collar upon the plpe having movement relative to the spider frame to regulate the suctionv of the fan.

v 7. An apparatus` for feeding pulverized f-uel, comprising a bin with an adjustable gate regulating the exit therefrom, shafts mounted in sultable bearings in the frame, sprocket wheels upon said shafts, a horizontal table having alternately arranged recesses and lugs upon the opposite edges thereof, endless sprocket chains mounted alternately upon the sprocket wheels upon said shafts and engaging alternate recesses in the opposite ends of the table,I a vacuum chamberinto which the material is fed by the chains, suction means connected to the vacuum chamber, and means the suction power.

In testimony whereof I hereunto alx my signature in presence of two witnesses.

EDWIN FERGERSON STEWART.

for regulating Witnesses:

WILLIAM JOHN LUECKEL, GILBERT Roncnm. Jr.

ive cents each, by addressing the Commissioner of Patents, Washington, D. C. 

